<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
</head>
<body>
	<table border="1">
	<tr>
		<th >title1</th>
		<th colspan="2">title2</th>
		<!-- <th >title3</th> -->
	</tr>
	<tr>
		<td colspan="3">row11</td>
		<!-- <td>row12</td>
		<td>row13</td> -->
	</tr>
	<tr>
		<td>row21</td>
		<td>row22</td>
		<td>row33</td>
	</tr>
	<tr>
		<td>row31</td>
		<td>row32</td>
		<td>row33</td>
	</tr>
</table>
</body>
</html>